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J Virol, March 1998, p. 1925-1930, Vol. 72, No. 3
Laboratoire de Génétique des
Virus, CNRS, 91198 Gif sur Yvette Cedex,
France,1 and
Federal Research Centre for
Virus Diseases of Animals, D-7400 Tübingen, Federal Republic of
Germany2
Received 22 August 1997/Accepted 8 December 1997
The RNA polymerase of rabies virus consists of two subunits, the
large (L) protein and the phosphoprotein (P), with 2,127 and 297 amino
acids, respectively. When these proteins were coexpressed via the
vaccinia virus-T7 RNA polymerase recombinant in mammalian cells, they
formed a complex as detected by coimmunoprecipitation. Analysis of P
and L deletion mutants was performed to identify the regions of both
proteins involved in complex formation. The interaction of P with L was
not disrupted by large deletions removing the carboxy-terminal half of
the P protein. On the contrary, P proteins containing a deletion in the
amino terminus were defective in complex formation with L. Moreover,
fusion proteins containing the 19 or the 52 first residues of P in
frame with green fluorescent protein (GFP) still bound to L. These
results indicate that the major L binding site resides within the 19 first residues of the P protein. We also mapped the region of L
involved in the interaction with P. Mutant L proteins consisting of the
carboxy-terminal 1,656, 956, 690, and 566 amino acids all bound to the
P protein, whereas deletion of 789 residues within the terminal region
eliminated binding to P protein. This result demonstrates that the
carboxy-terminal domain of L is required for the interaction with P.
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.
Mapping the Interacting Domains between the Rabies
Virus Polymerase and Phosphoprotein
*
Corresponding author. Mailing address: Laboratoire de
Génétique des Virus, CNRS, 91198 Gif sur Yvette Cedex,
France. Phone: 33 1 69 82 38 37. Fax: 33 1 69 82 43 08. E-mail:
danielle_blondel{at}cnrs-gif.fr.
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